Flora of North America species comparison

all or mostly opposite (distal sometimes alternate);

blades ± elliptic, 3–6(–10) × 1.2–2.8(–3.5) cm, bases rounded, margins toothed, apices ± rounded to acute, faces hirsutulous to hispido-scabrellous or scabrellous.

all or mostly alternate (proximal usually opposite);

blades deltate-ovate or deltate to lanceolate, 4–10(–25+) × 2–6(–15) cm, bases broadly cuneate to ± truncate, margins coarsely toothed to subentire, apices obtuse to acute, faces ± hirtellous.

± hemispheric, 8–10 mm diam.

± hemispheric, 5–7 mm diam.

(5–)11–13;

laminae (15–)25–30+ mm.

(9–)10–12+;

laminae 4–6 mm.

40–60(–80+);

corollas yellow.

20–25+;

corollas ochroleucous or white.

16–24+ in 2–3 series, ± erect, linear, 2–3+ mm.

12–15+ in 2 series, ± erect, spatulate to linear, 2.5–4 mm.

(3–)12–25+ in ± paniculiform arrays.

30–80+ in ± paniculiform arrays.

purplish black, ± obovate, 4–5 mm, faces glabrous;

pappi 0.5–1 mm.

dark brown to blackish, oblanceolate, 4–5 mm, faces ± hirtellous or glabrous;

pappi 1.5–2+ mm.

= 34.

= 34.